All fresh-water basins, taken together, make a small area compared with that of the sea or of the land; and, consequently, the competition between fresh-water productions will have been less severe than elsewhere; new forms will have been more slowly formed, and old forms more slowly exterminated.
I conclude, looking to the future, that for terrestrial productions a large continental area, which will probably undergo many oscillations of level, and which consequently will exist for long periods in a broken condition, will be the most favourable for the production of many new forms of life, likely to endure long and to spread widely.
The existence of such places will often depend on physical changes, which are generally very slow, and on the immigration of better adapted forms having been checked.
The blow was not a hard one, but the boy was so taken by surprise that he started back; the form caught the back of his knees, and over he went on to the floor behind.
So, though they were fagged more or less, and occasionally kicked or cuffed by the bullies, they were, on the whole, well off; and the fresh, brave school-life, so full of games, adventures, and good-fellowship, so ready at forgetting, so capacious at enjoying, so bright at forecasting, outweighed a thousand-fold their troubles with the master of their form, and the occasional ill-usage of the big boys in the house.
Several others present bound themselves not to fag for the fifth form at once.
In all reefs, owing to the sediment being washed out of the lagoon-channel to leeward, that side is least favourable to the long-continued vigorous growth of the corals; hence dead portions of reef not unfrequently occur on the leeward side; and these, though still retaining their proper wall-like form, are now in several instances sunk several fathoms beneath the surface.
6] The large claws or pincers of some of these crabs are most beautifully adapted, when drawn back, to form an operculum to the shell, nearly as perfect as the proper one originally belonging to the molluscous animal.
Lyell, even in the first edition of his "Principles of Geology," inferred that the amount of subsidence in the Pacific must have exceeded that of elevation, from the area of land being very small relatively to the agents there tending to form it, namely, the growth of coral and volcanic action.
The eventual election, again, is to be made by that branch of the legislature which consists of the national representatives; but in this particular act they are to be thrown into the form of individual delegations, from so many distinct and coequal bodies politic.
In the latter, the local or municipal authorities form distinct and independent portions of the supremacy, no more subject, within their respective spheres, to the general authority, than the general authority is subject to them, within its own sphere.
Only by separating the two sources of cognition, related to one another as form to content, do we get the mutually exclusive and separately incomprehensible conceptions of freedom and inevitability.
Apart from these two concepts which in their union mutually define one another as form and content, no conception of life is possible.
Yet there is one little trait in the description which shows that they are present to Plato's mind, namely, the remark that the soul, which had seen truths in the form of the universal, cannot again return to the nature of an animal.
The metaphysical conception of truth passes into a psychological one, which is continued in the Laws, and is the final form of the Platonic philosophy, so far as can be gathered from his own writings (see especially Laws).